Answer:
3. by studying plants and animals
Explanation:
Bringing harmful plants causes harm to the other species living there.
Destroying a lot of trees takes away a lot of homes from animals.
If you're just studying them no harm is being done.
Using pesticides can cause negative effects to the plants and animals who eat them.
The civil rights movement
Answer:
Environment
Explanation: movement from one Eco system to another Eco System
